Also, Sports Hard tires implemented across the board for T200-500... Makes it more interesting, if you ask me, to see what the tuners can do when asked to push those tires to the limit. I feel that Sports Soft tires are too easy/lazy to tune for at such low power.
I want what you're having.
300hp? Fine on hards, might be a bit slippery but nothing that can't be tuned out.
350hp or so, hards get sketchy and start becoming more of a fight to put power down than anything else, mediums are right around their "comfortable" limit.
400hp, hards will just cause fits, mediums are starting to give up the ghost as far as competent grip levels go, and softs are pretty much just right.
At 500hp, hards are pretty much as useful as tits on a frog, mediums not much better, and softs will still be a bit white-knuckle, albeit drivable.
Of course, I'm referring to RWD cars here. AWD takes all that and throws it out the window, remaining drivable straight up to 900+hp in the case of an RS6 or R35 on softs and controllable probably to around 700 on hards. Obviously, braking and cornering ability isn't really keeping up with how much speed you can build in a very short time at that point, but traction isn't a problem.
Basically, going with a 500hp cap on hards doesn't change the problem of TMax as it stands; it changes what the king is (it'd probably become a Kia instead of the R35 thanks to lower weight) but not the fact that no 2WD vehicle has even a snowball's chance in hell of keeping up on a "touge" course at those power levels on those tires. The less grip and/or more power you have, the bigger advantage AWD becomes.